- The three market Content Blocks preview as compact collapsible rows:

thumbnail of the actual image (hero background, intro image, insights
  cover), key copy in the summary line, full details expanded; card and
  intro-paragraph previews are wrapped in the same mechanism
- New SubmarketPluginPreview for vitec_usecaselist / vitec_productfeature /
  vitec_productlist: instead of bare standard boxes they now list the
  selected story titles (flagging stories that still lack a quote), the
  featured product and the hand-picked products in order
- Container-style collapse for whole page-module COLUMNS: a chevron at the
  right of every column header folds a section down to its title row,
  state kept per page and colPos in localStorage - the slot view of a
  sub-market page folds to six slim bands
- Previews sit under the page module's pointer-events lock and its
  click-to-edit layer: pointer events are re-enabled inside the collapse
  markup and the toggle runs on pointerdown in the capture phase
- Two more v14 removals fixed on the way, both latent in the OLDER preview
  classes too (Usecaseshow, Modelcard would have crashed the page module):
  GridColumnItem::getRecord() now returns a Domain\Record object, and
  StandaloneView is gone - previews normalize the record via a shared
  helper and render through the ViewFactory

packages/vitec/ContentBlocks/ContentElements/market-intro/templates/backend-preview.html

@@ -1,11 +1,29 @@
 <html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers" data-namespace-typo3-fluid="true">
 <f:layout name="Preview"/>
 <f:section name="Content">
+
 <f:asset.css identifier="vitec-backend-preview" href="EXT:vitec/Resources/Public/Css/backend-preview.css"/>
-<div class="vitec-preview">
-    <div class="vitec-preview__body">
-        <strong>Market Intro</strong> — <f:format.crop maxCharacters="120">{data.vitec_intro_text}</f:format.crop>
+<f:asset.script identifier="vitec-backend-collapse" src="EXT:vitec/Resources/Public/JavaScript/backend-preview-collapse.js"/>
+
+<details class="vitec-collapse">
+    <summary>
+        <f:if condition="{data.image.0}">
+            <f:image image="{data.image.0}" class="vitec-collapse__thumb" width="72c" height="44c" alt=""/>
+        </f:if>
+        <span class="vitec-collapse__label">2 · Market Intro</span>
+        <span class="vitec-collapse__hint"><f:format.crop maxCharacters="90">{data.intro_text}</f:format.crop></span>
+    </summary>
+    <div class="vitec-collapse__body">
+        <p>{data.intro_text}</p>
+        <p>
+            <strong>Learn more:</strong> <f:if condition="{data.learnmore_target}"><f:then>{data.learnmore_label} → {data.learnmore_target}</f:then><f:else>kein Button</f:else></f:if>
+            · <strong>Product Portfolio:</strong> <f:if condition="{data.show_portfolio}"><f:then>sichtbar</f:then><f:else>ausgeblendet</f:else></f:if>
+        </p>
+        <f:if condition="{data.image.0}">
+            <f:image image="{data.image.0}" width="280c" alt=""/>
+        </f:if>
     </div>
-</div>
+</details>
+
 </f:section>
 </html>